Electromagnetically actuated brake



Dec. 26, 1944;

W. F. PENROSE ELEGTROMAGNETICALLY ACTUATED BRAKE Original Filed Feb. 28, 1940 2 Sheets-Sheet l WQ Qf /a //7 I 4 1386- ,1 w. F. PENROSE ELECTROMAGNETICALLY AC TUATED BRAKE Original Fiied'Feb. 28, 1940 2 Sheets-Sheet 2 Patented Dec. 26, 1944 ELECTROMAGNETICALLY ACTUATED BRAKE William F. Penrose, Irvington, N. J assignor to Empire Electrical Brake Corporation, a corporation of Delaware Original application February 28, 1940, Serial No.

321,169, now Patent No. 2,273,065, dated'February 17, 1942. Divided and this application September 29, 1941, Serial No. 412,719

3 Claims. 01. 188-48) This inventionv relates to brakes'and has for its object the provision of an improved brake and brake assembly of the two-shoe single-anchor self-energizing articulated, type particularly adapted to be electromagnetically actuated by the electromagnet and lever combination dedisposed operating ends of links pivotally connected to the brake shoes respectively, through which selective actuation may be effected, all of which will be apparent from the following description of a preferred embodiment illustrated in the accompanying drawings, in which:

Fig. 1 is a front view of the brake and brake assembly, partly in section, showing the arrangement of the two shoes in articulated relation and the disposition thereof with respect to the single anchor;

I Fig. 1a is a top view of a portion of Fig. 1

showing the arrangement of the link members actuating the operating ends of the brake shoes; and

Fig. 2 is a side view, in section, taken along BB of Fig. 1. 1

Referring now to the drawings, the brake drum 90 forms part of the rotating wheel of a vehicle and the non-rotatable support or backing plate 94 is affixed upon the axle thereof in a conventional manner. The various adjacent parts of the wheel and axle of the vehicle are not shown as they form no part of the present invention.

The two brake shoes 92, 93 are articulated with the adjusting member 94 at the ends 95, 96 thereof. The oppositely disposed operating ends 91, 98 of the brake shoes 92, 93 are adapted to be selectively actuated through links 99, I pivotally connected to the brake shoes 92, 93 by pins IOI, I02. In,retracted position the brake shoes 92, 93 engage the adjustable anchor pin I03 carried by the backing plate 9|, which pin serves as a hanger for the brake shoes. also supported from and movable with the anchor pin I03. The lever I05 is pivoted about the pin I04. 7

Brake lining portions I06, I07 are affixed to the outer surfaces of the brake shoes 92, 93. A coil spring member I08 provides tension between the Thelever pivot pin I04 is operating ends of the brake shoes 92, 93 to hold the brake in the retracted position shown in Fig. 1. Y I

The actuating means forcontrollably applying the brake shoes 92, 93 in braking engagement with the flange portion I 09 of the drum comprises the electromagnet IIO-lever I05 combination pivoted at the pin I04, and the disc-like flatface armature plate I I,I with its face perpendicular to the drum axis H2, affixed to the web H3 at severalspaced points as at II4.

The lever I05 swings about the pivot pin I04 and comprises a relatively long arm II5 extending curvedly and offset to pass around the ,axis II2 to the electromagnet IIO .disposed at a point substantially more than 90 from the pivot pin I04, and a short arm IIB carrying pin II! which extends between the ends of the links 99, I00. The ends of the links 99, I00 are shaped as at H8, H9 to closely abut each half circumference of the pin II! when the brake shoes 92, 93 are in the retracted position.

The pin II'I depending upon the direction of movement of the lever I05, selectively actuates one or the other of the operating ends 91, 98 of the brake shoes 92, 93 through the then operating link. Assuming one direction of armature rotation, the energized electromagnet will be moved to the left in Fig. 1. In this event the pin II! will move to the right, actuating operating end 98 of brake shoe 92 through the link, I00. In so operating the pin I I I will move out of abutment with the link 99. During such movement the end of the link 99 will be supported on the curved surface member I20 so that when pin I I1 returns to its normal brake retracted position, th shaped ends I I8, I I9 of the links will again closely engage each half circumference of the pin II'I. During movement of the pin II! in the opposite direction link 99 will actuate operating end 91 of the brake shoe 93 through the link 99, while link I00 will be supported on the curved surface member I20.

It is to be noted that adjustment of the brake shoes may be readily made within the drum 99 with respect to the flange I09, both at the adjustable anchor I03 carried by the support or backing plate 9I, and at I2I of the adjustable member 94. v

The electromagnet I I0 is supported from within its structure at a plane closely adjacent the working face thereof on the lever arm. I I5 so as to permit of axial and limited universal pivotal movement with respect to the lever arm I05.

ment illustrated in the drawings without del parting from the gist of the invention as defined in the following claims.

I claim:

1. In an internal brake, the combination of a drum having a flange portion and adapted to rotate about an axis, a non-rotatable support fixedly arranged adjacent said drum, an anchor carried by said support, friction member means having oppositely disposed operating ends between which said anchor extends, a pivot pin supported by said anchor and arranged adjacent the said operating ends of the friction member, a lever pivoted on said pin and havin a s o t arm adapted to actuate said operating ends of the friction member means, said short arm of the lever having a pin member extending between said operating ends, link means pivotally connected on each of the said operating ends of the friction member means and having shaped free ends adapted to engage the said pin member on said short arm when the brake is in the retracted position, said link means being adapted to operatively move the friction member means into braking engagement with the drum flange upon movement of said lever about said pivot.

2. A brake comprising in combination, a drum,

a pair of articulated self-energizing brake shoes arranged within the drum and having oppositely disposed operating ends, an anchor extending between the operating ends of the brake shoes and adapted to so function during braking in either direction of drum rotation, links pivotally connected on the operating ends of said brake shoes and presenting oppositely disposed free 3. In combination with a drum, a brake therefor comprising, two articulated brake shoes having oppositely disposed operating ends, a support fixedly arranged adjacent said drum, an adjustable anchor carried by said support and extending between the operating ends of said brake shoes and providing a hanger for said shoes when in retracted position, means supported from said anchor for actuating the operating ends of the brake shoes including a movable pin member normally disposed in radial alignment with said anchor when said brake shoes are in retracted position, link means pivotally connected on the operating ends of said brake shoes and having free ends adapted to engage said movable pin member on opposite sides thereof, said links being adapted to operatively move the brake shoes into braking engagement with said drum upon displacement of said movable pin member, and means including said anchor for adjusting the position of said shoes, said links and movable pin member in fixed relation as a unit within said drum.

' WILLIAM F. PENROSE. 

